JPH09137098A - Water-based color ink for recording and ink-jet recording method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water-based color ink for recording, having good color balance, providing a clear recorded image and suitable for ink-jet recording and provide an ink-jet recording method using the ink. SOLUTION: This water-based color ink for recording is composed of a yellow ink, a magenta ink and a cyan ink, wherein the yellow ink contains 0.7-3wt.% of C.I. Acid Yellow 23, the magenta ink contains 0.7-3wt.% of a mixed dye consisting of C.I. Acid Red 52 and C.I. Acid Red 289 and the cyan ink contains 0.7-3wt.% of C.I. Acid Blue 9. The invention also relates to an ink-jet recording method using the color ink.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording aqueous color ink and an inkjet recording method.

[0002]

2. Description of the Related Art Ink jet recording methods include, for example, an electrostatic attraction method, a method of applying mechanical vibration or displacement to ink by using a piezoelectric element, and bubbles generated by heating ink, and the pressure generated at this time. How to use
Various types of ink ejection methods are used to form ink droplets, and some or all of these are deposited on a recording material such as paper for recording.

The ink composition used in such an ink jet recording method is prepared by dispersing or dissolving a water-soluble pigment or water-soluble dye exhibiting each color in water or a mixed solvent of water and a water-soluble organic solvent. Pigment ink compositions or dye ink compositions are known.

[0004] Ink jet recording ink compositions include:
It does not cause clogging in the head of the recording device or in the ink flow path, does not cause changes in physical properties or precipitation of solids during storage, gives a recorded image of sufficiently high density with a clear color tone, Recording can be performed without limiting the type of recording material, the fixing speed to the recording material is fast, the water resistance, weather resistance, solvent resistance, and abrasion resistance are excellent, and images with excellent resolution can be displayed. Performances such as giving and physical properties such as viscosity and surface tension within appropriate ranges are required. Above all,
It is important that the liquid stability is such that clogging does not occur in the head tip portion of the recording apparatus or in the ink flow path, and precipitate does not occur.

The pigment ink composition is excellent in weather resistance,
Since the pigment is dispersed in the solvent, the liquid stability is poor, and when it is stored for a long time, the dispersion of the pigment becomes unstable and aggregation occurs. For this reason, clogging easily occurs at the head end portion of the ink jet recording apparatus. Therefore, Japanese Patent Laid-Open No. 1-20
As disclosed in Japanese Patent Publication No. 4979, etc., the content of the constituents of the pigment ink composition is defined, and JP-A-64-6074 is used.
As disclosed in Japanese Patent Publication No.
Although improvement has been achieved by controlling H, it is not sufficiently durable for use as an inkjet recording ink.

Although the dye ink composition is inferior in weather resistance to the pigment ink composition, it is less likely to cause clogging in the head tip portion of the recording apparatus or in the ink flow path, and is therefore widely used as an inkjet recording ink. ing. Many of such dye ink compositions are water-based ink compositions obtained by dissolving water-soluble dyes having various chemical structures in water or a mixed solvent of water and a water-soluble organic solvent.

On the other hand, when a full-color recorded image is reproduced using an aqueous dye ink, four primary color inks obtained by adding black ink to three primary color inks of yellow ink, magenta ink and cyan ink are used. The color tone of the recorded image is determined by the decolorization mixture of. These inks are ideal primary colors of yellow, magenta, cyan, and black that do not have other hues in order to give a recorded image with a clear color tone, which is one of the above-mentioned ink performances. Is also required to be presented.

[0008]

However, in the dye ink compositions currently commercialized, the color balance of each color of yellow, magenta and cyan and the sharpness of the recorded image are not sufficient, and various improvements are required. It is said that.

Japanese Unexamined Patent Publication (Kokai) No. 5-214259 discloses a yellow ink containing acid yellow 23, diethylene glycol, a preservative and water, and a direct red 22.
There is disclosed a dye set comprising a magenta ink containing 7, diethylene glycol, a preservative and water, and a cyan ink containing Acid Blue 9, a diethylene glycol, a preservative and water. However, with this technique, although the color balance is improved, the sharpness of the recorded image is not sufficient.

The present invention has been made to solve the above-mentioned problems, and has a good color balance, a clear recorded image, and a recording aqueous color ink suitable for inkjet recording, and an inkjet recording method. The purpose is to provide.

[0011]

The above object is to provide a recording water-based color ink comprising a yellow ink, a magenta ink, and a cyan ink, wherein the yellow ink is a color index number / acid yellow 2
3 to 0.7 to 3% by weight, and the magenta ink contains 0.7 to 3% by weight of a mixed dye consisting of Color Index Number Acid Red 52 and Color Index Number Acid Red 289. The above cyan ink can be achieved by a water-based recording color ink containing 0.7 to 3% by weight of color index number Acid Blue 9. Hereinafter, the present invention will be described in detail.

The colorant of the yellow ink used in the present invention is Color Index Number Acid Yellow 23 (hereinafter referred to as "CI Acid Yellow 23") which is a water-soluble acid dye. C. above. I. The content of Acid Yellow 23 is 0.7 to 3% by weight based on the total amount of yellow ink. If it is less than 0.7% by weight or more than 3% by weight, not only the color density of the image recorded by the yellow ink, magenta ink, and cyan ink is not appropriate, but also the color balance of each color is deteriorated. Is limited to the above range.

The colorant for magenta ink used in the present invention is a water-soluble acid dye, Color Index Number Acid Red 52 (hereinafter referred to as "CI Acid Red 52") and Color Index Number Acid. Red 289 (hereinafter, referred to as “CI Acid Red 289”). C. above. I. Acid Red 52 and C.I. I. The content of the mixed dye of Acid Red 289 is 0.7-based on the total amount of magenta ink.
It is 3% by weight. If it is less than 0.7% by weight or more than 3% by weight, not only the color density of the image recorded by the yellow ink, magenta ink, and cyan ink is not appropriate, but also the color balance of each color is deteriorated. Is limited to the above range.

The colorant of the cyan ink used in the present invention is Color Index Number Acid Blue 9
(Hereinafter, referred to as "CI Acid Blue 9"). C. above. I. The content of Acid Blue 9 is 0.7 to 3% by weight based on the total amount of cyan ink. 0.7
If the amount is less than 3% by weight or more than 3% by weight, not only the color density of the image recorded by the yellow ink, magenta ink, and cyan ink is not appropriate, but also the color balance of each color is deteriorated. Limited to

In the present invention, the yellow ink, the magenta ink and the cyan ink can be obtained by dissolving a colorant in a solvent. As the solvent,
Water or a mixed solvent of water and a water-soluble organic solvent is preferable. As the water, it is preferable to use deionized water instead of general water containing various ions.

In the mixed solvent of water and the water-soluble organic solvent, the water-soluble organic solvent is used to prevent the ink from drying.

The water-soluble organic solvent is not particularly limited, and examples thereof include methyl alcohol, ethyl alcohol and n.
-Propyl alcohol, isopropyl alcohol, n-
Butyl alcohol, sec-butyl alcohol, ter
Lower alcohols such as t-butyl alcohol; amides such as dimethylformamide and dimethylacetamide; ketones such as acetone; keto alcohols such as diacetone alcohol; ethers such as tetrahydrofuran and dioxane; polyethylene glycol, polypropylene glycol, etc. Polyalkylene glycols; ethylene glycol, propylene glycol, butylene glycol,
Alkylene glycols such as diethylene glycol, triethylene glycol, dipropylene glycol, tripropylene glycol, thiodiglycol, and hexylene glycol; ethylene glycol monomethyl ether,
Ethylene glycol monoethyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, triethylene glycol monomethyl ethyl,
Lower alkyl ethers of polyhydric alcohols such as triethylene glycol monoethyl ethyl and triethylene glycol monobutyl ether; glycerin, 2-pyrrolidone, N-methyl-2-pyrrolidone, 1,3-dimethyl-
2-imidazolidinone and the like.

Of these, alkylene glycols such as glycerin and diethylene glycol; lower alkyl ethers of polyhydric alcohols such as triethylene glycol monoethyl ether are preferable.

Generally, the content of the water-soluble organic solvent is preferably 0 to 95% by weight based on the total amount of each ink. It is more preferably 10 to 80% by weight, and even more preferably 10 to 50% by weight. The water content at this time is determined in a wide range depending on the type and composition of the water-soluble organic solvent or the desired properties of the ink, but is generally 10 to 95 relative to the total amount of the ink. weight%,
Preferably 10 to 70% by weight, more preferably 20
７０70% by weight.

In the present invention, in the yellow ink, the magenta ink and the cyan ink, if necessary, for example, various cationic, anionic and nonionic surfactants; polyvinyl alcohol, celluloses, water-soluble Viscosity modifiers such as resins; surface tension modifiers; antifungal agents and the like may be added. Further, when an aqueous ink used in an ink jet recording method of charging a recording liquid is prepared, a resistivity adjusting agent such as an inorganic salt such as ammonium chloride may be added.

The water-based color ink for recording of the present invention is composed of the three primary colors of the yellow ink, the magenta ink and the cyan ink, but if necessary, it is composed of four primary colors using a black ink. May be

In the ink jet recording method of the present invention, the above recording aqueous color ink is used, and ink droplets of the above aqueous color ink are ejected from ejection ports according to a recording signal to perform recording on a recording material. The recording material is not particularly limited, and examples thereof include plain paper, coated paper, and transparent film.

In the present invention, when the above recording aqueous color ink is used, a good color balance of yellow, magenta, and cyan can be obtained and a clear image can be obtained, and the head end portion of the ink jet recording apparatus or the ink flow path can be obtained. The inkjet recording method that does not cause clogging is achieved.

[0024]

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples. The recording paper used for recording in Examples and Comparative Examples is "Xerox 4024DP201b" manufactured by Xerox Co., Ltd. unless otherwise specified.

Example 1 Pure water (71.5 parts by weight) was added with C.I. I. Acid Yellow 2
3 (1.5 parts by weight), glycerin (22 parts by weight) and diethylene glycol-n-monobutyl ether (5 parts by weight) were added, and the mixture was stirred for 30 minutes and then filtered through a membrane filter having a pore size of 0.7 μm to give a yellow ink. A composition was obtained. Similarly, pure water (72 parts by weight), C.I. I. Acid Red 52 (0.5 parts by weight), C.I. I. A magenta ink composition was obtained from Acid Red 289 (0.5 parts by weight), glycerin (22 parts by weight), and diethylene glycol-n-monobutyl ethyl (5 parts by weight). Similarly, pure water (71.7 parts by weight), C.I. I. Acid Blue 9
(1.3 parts by weight), glycerin (22 parts by weight), diethylene glycol-n-monobutyl ether (5 parts by weight)
A cyan ink composition was obtained. When these ink compositions were subjected to color recording using a shear mode type ink jet head disclosed in JP-A-2-150355, ejection was good, and the obtained recorded matter was clear and had a yellowish color. The color balance was good without tingling, reddishness, or bluishness.

Example 2 Pure water (70.5 parts by weight) was added with C.I. I. Acid Yellow 2
3 (2.5 parts by weight), glycerin (22 parts by weight) and diethylene glycol-n-monobutyl ether (5 parts by weight) were added, and the mixture was stirred for 30 minutes and then filtered with a membrane filter having a pore size of 0.7 μm to give a yellow ink. A composition was obtained. Similarly, pure water (70.5 parts by weight), C.I. I. Acid Red 52 (1.5 parts by weight), C.I. I. A magenta ink composition was obtained from Acid Red 289 (1 part by weight), glycerin (22 parts by weight) and diethylene glycol-n-monobutyl ether (5 parts by weight). Similarly, pure water (70.3 parts by weight), C.I. I. Acid Blue 9
(2.7 parts by weight), glycerin (22 parts by weight), diethylene glycol-n-monobutyl ether (5 parts by weight)
A cyan ink composition was obtained. When these ink compositions were subjected to color recording using a shear mode type ink jet head disclosed in JP-A-2-150355, ejection was good, and the obtained recorded matter was clear and had a yellowish color. The color balance was good without tingling, reddishness, or bluishness.

Example 3 C. I. Acid Red 52 and C.I. I. Example 1 except that the mixing ratio of Acid Red 289 was 7: 3 and the magenta ink composition was prepared without changing the total mixing amount.
In the same manner as in the above, an ink composition was obtained. When recording was carried out in the same manner as in Example 1, the jetting was good, the obtained recorded matter was clear, and the color balance was good without being yellowish, reddish or bluish.

Example 4 C. I. Acid Red 52 and C.I. I. Example 1 except that the mixing ratio of Acid Red 289 was 4: 6 and the magenta ink composition was prepared without changing the total amount of mixing.
In the same manner as in the above, an ink composition was obtained. When recording was carried out in the same manner as in Example 1, the jetting was good, the obtained recorded matter was clear, and the color balance was good without being yellowish, reddish or bluish. .

Comparative Example 1 C. I. An ink composition was obtained in the same manner as in Example 1 except that Acid Yellow 23 was changed to 0.5 part by weight.
When recording was performed in the same manner as in Example 1, the ejection was good, but the obtained recorded material was light yellow, the color that should originally be red was crimson, and the color that should be green was bluish green. As a result, the color was bluish and the color balance was poor. Comparative Example 2 C.I. I. An ink composition was obtained in the same manner as in Example 1 except that Acid Yellow 23 was changed to 3.5 parts by weight. When recording was carried out in the same manner as in Example 1, the ejection was good, but the obtained recorded material had a deep yellow color, the color that should originally be red was light yellow, and the color that should be green was yellow green. The overall color was yellowish and the color balance was poor.

Comparative Example 3 C. I. Acid Red 52, 0.2 parts by weight, C.I. I.
An ink composition was obtained in the same manner as in Example 1 except that Acid Red 289 was changed to 0.2 part by weight (0.4 parts by weight in total). When recording was carried out in the same manner as in Example 1, the ejection was good, but the magenta of the obtained recorded matter was light, the color that should originally be red became a light color, and the color that should be blue became a light blue, It has a greenish color as a whole,
The color balance was bad. Comparative Example 4 C.I. I. 1.8 parts by weight of Acid Red 52, C.I. I.
An ink composition was obtained in the same manner as in Example 1 except that Acid Red 289 was set to 1.8 parts by weight (both combined 3.6 parts by weight). When recording was carried out in the same manner as in Example 1, the jetting was good, but the magenta of the obtained recorded matter was dark, the color that should originally be red was red, the color that should be blue was purple, and the overall color was red. It has a bright color,
The color balance was bad.

Comparative Example 5 C. I. An ink composition was obtained in the same manner as in Example 1 except that the amount of Acid Blue 9 was changed to 0.5 part by weight. When recording was performed in the same manner as in Example 1, the ejection was good, but
The cyan color of the obtained recorded matter was thin, the color that should originally be blue was purple, the color that should be green was yellow green, and the color was reddish as a whole, and the color balance was poor. Comparative Example 6 C.I. I. An ink composition was obtained in the same manner as in Example 1 except that Acid Blue 9 was used in 3.5 parts by weight. When recording was performed in the same manner as in Example 1, the ejection was good, but
The cyan color of the obtained recorded matter was dark, the color that should originally be blue was light blue, the color that should be green was turquoise, and the color was bluish as a whole, and the color balance was poor.

Comparative Example 7 C. I. An ink composition was obtained in the same manner as in Example 1 except that the yellow ink composition was prepared by using Color Index Number Direct Yellow 86 instead of Acid Yellow 23. When recording was carried out in the same manner as in Example 1, the ejection was good, but the yellow color of the obtained recording material was yellow, and the overall color balance was poor. Comparative Example 8 C.I. I. An ink composition was obtained in the same manner as in Example 1 except that the magenta ink composition was prepared using only Acid Red 289 (1 part by weight). When recording was performed in the same manner as in Example 1, ejection was good, but magenta of the obtained recorded matter was pinkish and the overall color balance was poor.

Comparative Example 9 C. I. An ink composition was obtained in the same manner as in Example 1 except that a cyan ink was prepared by using Color Index Number Direct Blue 86 instead of Acid Blue 9. When recording was performed in the same manner as in Example 1, ejection was good, but cyan of the obtained recording was bluish, and the overall color balance was also poor. Comparative Example 10 C.I. I. Acid Yellow 23 is 0.5 part by weight,
C. I. Acid Red 52 is 0.2 parts by weight, and C.I.
I. Acid Red 289 is 0.2 parts by weight, and C.I.
I. An ink composition was obtained in the same manner as in Example 1 except that each ink composition was prepared with 0.5 part by weight of Acid Blue 9. When recording was performed in the same manner as in Example 1, the ejection was good, but the color of the entire recorded material was light,
The color density was not sufficient.

Comparative Example 11 C. I. Acid Yellow 23 is 3.5 parts by weight,
C. I. Acid Red 52 was set to 1.8 parts by weight, and C.I.
I. Acid Red 289 was set to 1.8 parts by weight, and C.I.
I. An ink composition was obtained in the same manner as in Example 1, except that each ink composition was prepared by using Acid Blue 9 in an amount of 3.5 parts by weight. When recording was performed in the same manner as in Example 1, the ejection was good, but the color of the entire recorded material was dark,
It became a dark recorded material lacking in sharpness.

As described above, in each of the ink compositions of Examples 1 to 4 in which recorded matter having good ejection, clear and good color balance was obtained, C.I. I. Acid Yellow 23 is used as a colorant for magenta ink in C.I. I. Acid Red 52 and C.I. I. Acid Red 289 mixed dye was used as a colorant for cyan ink. I. I used Acid Blue 9. Further, the above C. I. Acid Yellow 23 has a concentration of 0.7 to 3% by weight, and the C.I. I. Acid Red 52 and C.I. I. Acid Red 289 has a mixed total concentration of 0.7 to 3% by weight, and the C.I. I. The concentration of Acid Blue 9 was 0.7 to 3% by weight.

On the other hand, the obtained recorded products were not clear and the color balance was poor, so that none of the above conditions was satisfied.

[0037]

Since the water-based color ink for recording and the ink jet recording method of the present invention are as described above, there is no clogging at the tip of the head of an ink jet printer or in the ink flow path, and yellow, magenta, cyan It is possible to obtain a clear recorded image with good color balance.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masahito Kato, 15-1 Naedai-cho, Mizuho-ku, Nagoya-shi Brother Industrial Co., Ltd. Within

Claims (2)

[Claims] 1. A recording aqueous color ink comprising a yellow ink, a magenta ink and a cyan ink, wherein the yellow ink contains 0.7 to 3% by weight of a color index number Acid Yellow 23. The magenta ink contains 0.7 to 3% by weight of a mixed dye consisting of Color Index Number Acid Red 52 and Color Index Number Acid Red 289, and the cyan ink contains Color Index Number Acid Blue 9 Is contained in an amount of 0.7 to 3% by weight. 2. An ink jet recording method for recording an image on a recording material by ejecting ink droplets from an ejection port according to a recording signal, wherein the ink is the recording water-based color ink according to claim 1. And an inkjet recording method.